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    • Alexei Starovoitov's avatar
      Merge branch 'bpf: tools: support build selftests/bpf with clang' · cdf0e80e
      Alexei Starovoitov authored
      Yonghong Song says:
      
      ====================
      
      To build kernel with clang, people typically use
        make -j60 LLVM=1 LLVM_IAS=1
      LLVM_IAS=1 is not required for non-LTO build but
      is required for LTO build. In my environment,
      I am always having LLVM_IAS=1 regardless of
      whether LTO is enabled or not.
      
      After kernel is build with clang, the following command
      can be used to build selftests with clang:
        make -j60 -C tools/testing/selftests/bpf LLVM=1 LLVM_IAS=1
      
      I am using latest bpf-next kernel code base and
      latest clang built from source from
        https://github.com/llvm/llvm-project.git
      Using earlier version of llvm may have compilation errors, see
        tools/testing/selftests/bpf
      due to continuous development in llvm bpf features and selftests
      to use these features.
      
      To run bpf selftest properly, you need have certain necessary
      kernel configs like at:
        bpf-next:tools/testing/selftests/bpf/config
      (not that this is not a complete .config file and some other configs
       might still be needed.)
      
      Currently, using the above command, some compilations
      still use gcc and there are also compilation errors and warnings.
      This patch set intends to fix these issues.
      Patch #1 and #2 fixed the issue so clang/clang++ is
      used instead of gcc/g++. Patch #3 fixed a compilation
      failure. Patch #4 and #5 fixed various compiler warnings.
      
      Changelog:
        v2 -> v3:
          . more test environment description in cover letter. (Sedat)
          . use a different fix, but similar to other use in selftests/bpf
            Makefile, to exclude header files from CXX compilation command
            line. (Andrii)
          . fix codes instead of adding -Wno-format-security. (Andrii)
        v1 -> v2:
          . add -Wno-unused-command-line-argument and -Wno-format-security
            for clang only as (1). gcc does not exhibit those
            warnings, and (2). -Wno-unused-command-line-argument is
            only supported by clang. (Sedat)
      ====================
      Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
      cdf0e80e